Not only are they super cute, they're pretty cheap as well, especially if you can somehow get a few more uses out of them (siblings?). Pick from a bumble bee, a chicken, a dragon or my personal fave, the monkey. There are 11 different styles in all.

All the costumes are priced at $22.50 and come in sizes 0-6 months, 6-12 months, 12-24 months, 2T/3T and 4T/5T. You can find them at Old Navy stores or at oldnavy.com. (And it looks like some of the costumes are marked down to $12.50 online.)